It seems clear to me that, in the theatre as elsewhere, there will not be a return to the status quo ante. How things will change is, like everything else, to be determined. But there is a lot of foundational error in some of the recent posts in this thread.
First of all, Broadway is, for the most part, a commercial enterprise and also one in which (with few exceptions) each tub is on its own bottom so it is not going to make sense for shows to offer dramatically lower prices to draw people back in. That is suicidal. Second, unions are what makes Broadway so making them a thing of the past is also suicidal. Third, re landlords, there is not a lot to renegotiate. The lion's share of revenue to the owners is percentage based. Although yes there can be a bit of negotiation, it is so far from a major consideration as to be generally irrelevant. I could go on but in the words of Bette Midler ...